Merge branch '517147-template-filter-nl' into 'master'

Make work item template search case insensitive

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/180280



Merged-by: Himanshu Kapoor <hkapoor@gitlab.com>
Approved-by: Jack Chapman <jachapman@gitlab.com>
Approved-by: Himanshu Kapoor <hkapoor@gitlab.com>
Co-authored-by: Nick Leonard <nleonard@gitlab.com>